The Plastiki is a ship made from plastic bottles. It was built from this frequently wasted product in order to promote recycling. Last March it left California, heading for Australia. Today, it docked in Sydney, completing a 8,000-mile voyage. The captain, David de Rothschild, described the journey:

De Rothschild, 31, said the idea for the journey came to him after he read a United Nations report in 2006 that said pollution — and particularly plastic waste — was seriously threatening the world's oceans.

He figured a good way to prove that trash can be effectively reused was to use some of it to build a boat. The Plastiki — named after the 1947 Kon-Tiki raft sailed across the Pacific by explorer Thor Heyerdahl — is fully recyclable and gets its power from solar panels and windmills.

The boat is almost entirely made up of bottles, which are held together with an organic glue made of sugar cane and cashews, but includes other materials too. The mast, for instance, is recycled aluminum irrigation pipe.